CONDENSED CONSOLIDATED STATEMENT OF OTHER COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 10,721	$ (1,314)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	333	1,408
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	(10,819)	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(38)	(1)
Other Comprehensive Income (Loss), Net of Tax	(10,524)	1,407
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 197	$ 93